Step
| Action
| Value(s)
| Yes
| No
|
1
| Did you perform the
Charging System Check
?
| --
|
Go to Step 2
| Go to
Charging System Check
|
2
| Check the battery
hydrometer.
Is the green dot visible in the hydrometer?
| --
|
Go to Step 7
|
Go to Step 3
|
3
| Diagnose the battery hydrometer. Refer to
Battery Hydrometer Displays Dark or Yellow Dot
.
Is the charging system diagnosis complete?
| --
|
Go to Step 22
| --
|
4
| Perform the battery load test. Refer to
Battery Not Operating Properly
.
Did the battery pass the load test?
| --
|
Go to Step 6
|
Go to Step 5
|
5
| Replace the battery. Refer to Battery Replacement.
Is the repair complete?
| --
|
Go to Step 22
| --
|
6
| Check the generator. Refer to
Generator Not Operating Properly
.
Does the generator operate properly?
| --
|
Go to Step 7
|
Go to Step 21
|
7
|
- Disconnect the generator connector.
- Turn the ignition switch to RUN.
- Using a J 39200
digital multimeter (DMM) set to DC volts, measure the voltage from the generator
connector terminal B (Buick) or Terminal L (Oldsmobile) to
ground.
Is the measured voltage within the specified range?
| 5-14V
|
Go to Step 8
|
Go to Step 18
|
8
| Check CKT 225 (RED) and CKT 23 (GRY) for
an intermittent short to ground or open condition.
Are the circuits OK?
| --
|
Go to Step 22
|
Go to Step 9
|
9
| Repair
CKT 225 (RED) or CKT 23 (GRY).
Is the repair complete?
| --
|
Go to Step 22
| --
|
10
|
- Reconnect the generator connector.
- Turn all the accessories off.
- Run the engine at a fast idle.
- Measure the voltage across the battery terminals.
Is the measured voltage within the specified range?
| 13-16V
|
Go to Step 22
|
Go to Step 11
|
11
| Is the vehicle a Buick?
| --
|
Go to Step 18
|
Go to Step 12
|
12
|
- Keep the engine running at fast idle.
- Disconnect the battery thermistor connector, located near the
battery.
- Using a DMM set to DC volts scale, measure the voltage across
the battery terminals.
Is the measured voltage in the specified range?
| 13-16V
|
Go to Step 13
|
Go to Step 18
|
13
|
- Turn the ignition switch to OFF.
- Using a DMM set to DC volts scale, measure the voltage at battery
thermistor connector terminal A (body harness side).
Is the measured voltage in the specified range?
| 10-15V
|
Go to Step 15
|
Go to Step 14
|
14
|
- Check the BATT THERM fuse for an open.
- If the fuse is open, repair CKT 540 (ORN) short to ground.
- If the fuse is OK, repair open or high resistance in CKT 540
(ORN).
Is the repair complete?
| --
|
Go to Step 22
| --
|
15
|
- Disconnect the generator connector.
- Connect a fused jumper from generator harness connector terminal S
to ground.
- Connect a DMM set to ohms scale between the battery thermistor
connector terminal B (body harness side) and ground.
Is the measured resistance in the specified range?
| Less than 5ohms
|
Go to Step 17
|
Go to Step 16
|
16
| Repair high resistance or open
in CKT 725 (LT BLU).
Is the repair complete?
| --
|
Go to Step 22
| --
|
17
|
- Check the battery thermistor connector for poor terminal contact.
- If OK, replace the battery thermistor.
Is the repair complete?
| --
|
Go to Step 22
| --
|
18
| Check for an open or short to ground in CKT 225 (RED).
Is the circuit OK?
| --
|
Go to Step 20
|
Go to Step 19
|
19
| Repair
CKT 225 (RED).
Is the repair complete?
| --
|
Go to Step 22
| --
|
20
|
- Check the powertrain control module (PCM) connectors for poor
terminal contact.
- If OK, replace the PCM. Refer to
Powertrain Control Module Replacement/Programming
in Engine Controls.
Is the repair complete?
| --
|
Go to Step 22
| --
|
21
| Replace the generator. Refer to
Generator Replacement
.
Is the repair complete?
| --
|
Go to Step 22
| --
|
22
| Repeat the Charging System Check. Refer to
Charging System Check
.
Is the system check complete?
| --
| System OK
| --
|
